62620b6aad
_bt_endpoint is a helper function for _bt_first that's called whenever no useful insertion scan key can be used, and we need to lock and read either the leftmost or rightmost leaf page in the index. Simplify and document its preconditions, relieving its _bt_first caller from having to end the parallel scan when it returns false. Also stop unnecessarily invalidating the current scan position in nearby code in both _bt_first and _bt_endpoint. This seems to have been copy-pasted from _bt_readnextpage, where invalidating the scan's current position really is necessary. Follow-up to the refactoring work in commit 1bd4bc85.
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.